Gitea - A painless self-hosted Git service
GitBucket - GitBucket is the easily installable open-source GitHub clone written with Scala.
Bonobo Git Server - Set up your own self hosted git server on IIS for Windows.
Gitstack - GitStack is a free software that let you setup your own private Git server on Windows.
GitLab - Create, review and deploy code together with GitLab open source git repo management software | GitLab
Launchpad.net - Launchpad is a software collaboration platform by Canonical